DOI: 10.36347/sjds.2015.v02i07.007

Pages: 416-421

Abstract: Bleaching has been accepted as the most conservative treatments for discolored teeth. In vitro examination of the effects of the bleaching agents such as carbamide peroxide 10%, carbamide peroxide20%and hydrogen peroxide 40%, on micro chemical structure of human enamel by Fourier Transform Infrared (FTIR) spectroscopy, was the aim of this study. In this study, thirty healthy human teeth were used and they were divided into three groups of ten. From each tooth two enamel blocks with dimensions of 4 × 3 × 2 mm were prepared. In each group, a block was considered as a control block (immersed in distilled water) and the other block was treated in bleaching condition as follow: 1) hydrogen peroxide 40%, 2) carbamide peroxide 10%,3) carbamide peroxide 20%.During the tests, the samples were submerged(immersed)in distilled water. Then, the samples were powdered separately, and the spectra of powdered samples were taken and each spectrumwasconsistedofPO43-, CO4-2, OH-signals respectively. Frequency changes were evaluated and data was analyzed by variance test, (P <0.05). In the results the spectra of control and bleached samples, structural change were not detected but in terms of quantity, it was found that the frequency average of bleached samples was decreased. The maximum reduction of hydrogen peroxide 40% was P = (OH- (3313.00), CO3-2 (1447.30),PO 43- (1031.80), and the minimum reduction in the carbamide peroxide 10% was P = (OH- (3347.90),CO3-2 (1451.20),PO 43- (1040.30),respectively. In conclusion Based on this study, bleaching agents may reduce enamel mineral content, especially when the concentration of peroxide is high. As well as, the presence of fluoride and desensitizing agents in bleaching agents, balance the reduction of enamel mineral contents.